CN110531296B - Gain calibration method of battery management system - Google Patents
Gain calibration method of battery management system Download PDFInfo
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- CN110531296B CN110531296B CN201910735946.5A CN201910735946A CN110531296B CN 110531296 B CN110531296 B CN 110531296B CN 201910735946 A CN201910735946 A CN 201910735946A CN 110531296 B CN110531296 B CN 110531296B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention relates to the technical field of battery detection, in particular to a gain calibration method of a battery management system, which comprises the following steps: step S1, acquiring a voltage measurement circuit signal chain of the battery management system; step S2, inputting the reference VREF as a signal chain; step S3, disconnecting the battery pack and accessing a reference VREF for gain calibration; the device also comprises a battery pack, a multi-way switch, an ADC unit and a reference VREF connected with the ADC unit; the multi-way switch is connected with the battery pack and used for selectively controlling the on-off of the battery circuit; the ADC unit is directly or indirectly connected with the multi-way switch and used for converting the input voltage signal into a digital signal; a reference VREF is selectively connected between the ADC unit and the multi-way switch; the gain of the measurement system is prevented from being influenced by the change of the resistance and the capacitance along with the environmental factors such as temperature, humidity, stress and the like, so that the gain calibration precision of the system is improved.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a gain calibration method of a battery management system.
Background
The measurement system consists of an ADC, a reference source and a preposed signal conditioning circuit such as an amplifier. The ratio of the output of the ADC and the input of the measurement system, i.e. the gain of the signal chain. The stability of the gain directly affects the measurement accuracy of the system. Battery Management System (BMS) extensively is used for occasions such as notebook computer, cell-phone, electric tool, electric bicycle, electric automobile, and the battery often is the multisection series connection and constitutes a module moreover, and the voltage of every section of battery of accurate measurement is the key of guaranteeing battery safety and stability operation.
As early as in the conventional measurement system, the gain of the amplifier and the ADC are affected by circuit parameters such as resistance and capacitance, which may also vary with environmental factors such as temperature, humidity, stress, etc., thereby resulting in the gain of the system not being calibrated and large measurement error.
Disclosure of Invention
The present invention aims to overcome the drawbacks and deficiencies of the prior art and to solve the above mentioned problems.
In order to achieve the purpose, the invention provides the following technical scheme: the gain calibration method of the battery management system comprises the following steps:
step S1, acquiring a voltage measurement circuit signal chain of the battery management system;
step S2, inputting the reference VREF as a signal chain;
in step S3, the battery pack is disconnected and the reference VREF is accessed for gain calibration.
As one technical solution of the present invention, in step S2, a switch unit is used to control connection and disconnection of the reference VREF to the signal chain.
As a technical solution of the present invention, the method further includes a battery pack, a multi-way switch, an ADC unit, and a reference VREF connected to the ADC unit;
the multi-way switch is connected with the battery pack and used for selectively controlling the on-off of the battery circuit;
the ADC unit is directly or indirectly connected with the multi-way switch and is used for converting the input voltage signal into a digital signal;
the reference VREF can be selectively accessed between the ADC unit and the multi-way switch.
As a technical scheme of the invention, the battery pack is formed by connecting a plurality of monocells in series, and the multi-way switch can independently control the on-off of each monocell access circuit.
As a technical scheme of the invention, a preposed signal conditioning circuit is arranged between the battery pack and the ADC unit and is used for isolating the battery pack from the ADC unit.
As an aspect of the present invention, in the battery management system with multiple measurement paths, the gain calibration of the low-end path is performed in the sequence of step S1, step S2, and step S3, and the gain calibration of the high-end path is performed as follows:
obtaining the gain of a low-end path;
the low-end path and the high-end path are connected to the same single battery;
comparing the gain measured by the high-end path with the gain measured by the low-end path;
carrying out gain calibration adjustment on a high-end path;
as a technical solution of the present invention, if the gain measured by the high-end path is consistent with the gain comparison result measured by the low-end path, the gain of the high-end path is calibrated;
if the gain measured by the high-end path is inconsistent with the gain comparison result measured by the low-end path, the gain of the high-end path is adjusted according to the gain value of the low-end path;
as a technical scheme of the invention, the battery pack is disconnected in a signal chain and is connected with a reference VERF, and the relation between the measurement output and the battery pack voltage is as follows:
Vref＝Vref×Av×Douti.e. Av＝1/Dout；
Wherein A isvIs the gain of the measurement system, equal to the product of the gain of the pre-signal conditioning circuit and the ADC unit;
as a technical solution of the present invention,
the high-end path gain calibration is realized by respectively measuring the voltages of the same single cell (n), and the high-end path gain calibration satisfies the following relation:
Vcell(n)＝Vref×Av1×Dout1，Vcell(n)＝Vref×Av2×Dout2i.e. Av2＝Av1×Dout1/Dout2；
Wherein A isv1Is the calibrated gain of the low-end path, Av2Is the high-end path gain to be calibrated.
The invention has the beneficial effects that:
the gain of the measurement system is prevented from being influenced by the change of the resistance and the capacitance along with the environmental factors such as temperature, humidity, stress and the like, so that the gain calibration precision of the system is improved.
Drawings
Fig. 1 is a schematic view of a BMS voltage measurement;
fig. 2 is a schematic view of BMS voltage measurement for two measurement paths;
fig. 3 is a schematic diagram of BMS for calibrating gain using a reference source according to the present invention;
fig. 4 is a gain diagram illustrating the BMS calibrating two measurement paths using a reference source according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Referring to fig. 1, a BMS voltage measurement schematic;
the ADC unit converts an input voltage signal into a digital signal, the preposed signal conditioning circuit is used for isolating the battery and the ADC, and the multi-way switch is used for selecting the measured battery.
A BMS voltage measurement schematic for one two measurement path with reference to fig. 2;
wherein, two passageways measure different batteries respectively, and the upper end passageway measures the battery of high order in the group battery, and the lower extreme measures the passageway and measures the battery of status.
In the present invention, the preposed signal conditioning circuit can comprise, for example, an amplifier, a filter, an attenuator, etc., and can be flexibly selected according to actual requirements.
It can be seen that in the BMS measurement system, the offset voltage can be eliminated by auto-zero calibration, and assuming that the battery voltage is Vcell, the relationship between the measurement output and the battery voltage is:
Vcell＝Vref×Av×Dout(ii) a Where Av is the gain of the measurement system, which is equal to the product of the gain of the pre-signal conditioning circuit and the ADC unit. '
Obviously, the gain of the pre-signal conditioning circuit and the ADC unit are affected by circuit parameters such as resistance and capacitance, which may also vary with temperature, humidity, stress, and other environmental factors.
Therefore, the measurement method is not calibrated, and the measurement error is large.
Referring to fig. 3 and 4, in the present invention, a gain calibration method for a battery management system includes the following steps:
step S1, acquiring a voltage measurement circuit signal chain of the battery management system;
step S2, inputting the reference VREF as a signal chain;
in step S3, the battery pack is disconnected and the reference VREF is accessed for gain calibration.
In this embodiment, in step S2, a switch unit is used to control the connection and disconnection of the reference VREF to the signal chain.
In this embodiment, the method further includes a battery pack, a multi-way switch, an ADC unit, and a reference VREF connected to the ADC unit;
the multi-way switch is connected with the battery pack and used for selectively controlling the on-off of the battery circuit;
the ADC unit is directly or indirectly connected with the multi-way switch and is used for converting the input voltage signal into a digital signal;
the reference VREF can be selectively accessed between the ADC unit and the multi-way switch.
In one embodiment, the battery pack is composed of a plurality of single batteries connected in series, and the multi-way switch can be used for independently controlling the connection and disconnection of each single battery to the circuit.
In one embodiment, a preposed signal conditioning circuit is arranged between the battery pack and the ADC unit to isolate the battery pack and the ADC unit.
As shown in fig. 3, a reference source VREF is connected between a preposed signal conditioning circuit (such as an amplifier) and a multi-way switch, and the switch S2 is used to control the connection and disconnection of the reference source VREF as a signal chain input. For example, switch S2 is closed, reference source VREF is switched in the signal chain, switch S2 is opened, and reference source VREF is opened.
It will further be appreciated that with the signal chain breaking the battery pack and closing switch S2 to access reference VERF, the measurement output and battery pack voltage relationship is as follows:
Vref＝Vref×Av×Douti.e. Av＝1/Dout；
Wherein A isvIs the gain of the measurement system, equal to the product of the gain of the pre-signal conditioning circuit and the ADC unit.
It can be seen that AvThe gain can be calibrated independently of the reference VREF.
In one embodiment, referring to fig. 4, for the battery management system with multiple measurement paths, the gain calibration of the low-end path is performed in the sequence of steps S1, S2, and S3, and the gain calibration of the high-end path is performed as follows:
obtaining the gain of a low-end path;
the low-end path and the high-end path are connected to the same single battery;
comparing the gain measured by the high-end path with the gain measured by the low-end path;
carrying out gain calibration adjustment on a high-end path;
as shown in fig. 4, in one embodiment, the gains of two measurement paths are taken as an example.
The switch S2 is closed and the gain measurement of the low-side path is made in the same manner as in the previous embodiment to obtain the calibration gain av1。
Specifically, one end of each of the switches S4 and S5 is commonly connected to two ends of a single cell in the battery pack, the other end of each of the switches S4 and S5 is connected to the high-end path and the low-end path, and the switches S5 and S2 are closed to perform gain calibration a on the low-end pathv1. Then (after opening S5) S4 is closed and a gain measurement of the high-side path is made.
If the gain measured by the high-end path is consistent with the gain comparison result measured by the low-end path, the gain of the high-end path is calibrated;
if the gain measured by the high-end path is inconsistent with the gain comparison result measured by the low-end path, the gain of the high-end path is adjusted according to the gain value of the low-end path;
it will be further appreciated that since the same cell is measured, the voltages across the two terminals are the same.
The high-end path gain calibration is realized by measuring the voltages of the same single cell (n), namely, the same single cell is measured with the low-end path, and the following relation is satisfied:
Vcell(n)＝Vref×Av1×Dout1，Vcell(n)＝Vref×Av2×Dout2i.e. Av2＝Av1×Dout1/Dout2；
Wherein, Av1Is the calibrated gain of the low-end path, Av2Is the high-end path gain to be calibrated.
It can be seen that Av2And Vcell(n)、VrefRegardless, via example A described abovev1Has been calibrated, thus Av2The calibration can be adjusted.
Furthermore, the gain calibration of the system is prevented from being influenced by environmental factors such as temperature, humidity, stress and the like.
The above-mentioned embodiments only represent some embodiments of the present disclosure, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present disclosure. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present disclosure, which falls within the protection scope of the present disclosure. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A gain calibration method of a battery management system is characterized by comprising the following steps:
step S1, acquiring a voltage measurement circuit signal chain of the battery management system;
step S2, inputting a reference VREF connected with the ADC unit as a signal chain, and controlling the connection and disconnection of the reference VREF to the signal chain by adopting a switch unit;
step S3, disconnecting the battery pack and accessing the reference VREF for gain calibration, disconnecting the battery pack and accessing the reference VREF in the signal chain, and measuring the relation between the output and the battery pack voltage as follows:
wherein the content of the first and second substances,
is the gain of the measurement system, equal to the product of the gain of the pre-signal conditioning circuit and the ADC unit;
for the battery management system with multiple measurement paths, the gain calibration of the low-end path is performed in the sequence of step S1, step S2, and step S3, and the gain calibration of the high-end path is performed as follows:
obtaining the gain of a low-end path;
the low-end path and the high-end path are connected to the same single battery;
comparing the gain measured by the high-end path with the gain measured by the low-end path;
carrying out gain calibration adjustment on a high-end path;
high-end path gain calibration is performed by measuring the same single cell respectively
Is achieved by satisfying the following relationship:
2. The gain calibration method of a battery management system according to claim 1, further comprising a battery pack, a multiplexer, and an ADC unit;
the multi-way switch is connected with the battery pack and used for selectively controlling the on-off of the battery circuit;
the ADC unit is directly or indirectly connected with the multi-way switch and is used for converting the input voltage signal into a digital signal;
the reference VREF can be selectively accessed between the ADC unit and the multi-way switch.
3. The gain calibration method of a battery management system according to claim 2,
the battery pack is formed by connecting a plurality of monocells in series, and the multi-way switch can independently control the on-off of each monocell access circuit.
4. The method of claim 2, wherein a pre-signal conditioning circuit is disposed between the battery pack and the ADC unit to isolate the battery pack from the ADC unit.
5. The method of gain calibration of a battery management system of claim 1,
if the gain measured by the high-end path is consistent with the gain comparison result measured by the low-end path, the gain of the high-end path is calibrated;
and if the gain measured by the high-end path is inconsistent with the gain comparison result measured by the low-end path, adjusting the gain of the high-end path according to the gain value of the low-end path.
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